get_email

THE RISK

Low Risk

Why get_email needs a policy

This tool retrieves email content by ID, which is a read-only operation that queries existing data without creating, modifying, deleting, or executing any actions. While email may contain sensitive information, the tool itself performs a straightforward retrieval with no blast radius beyond exposing data already owned by the user.

From the tool's definition Tool name 'get_email' combined with description 'Get a specific email by ID' indicates data retrieval without modification. No side effects mentioned.

Documented attack patterns abuse exactly the kind of access get_email gives an agent:

POLICY

How to control get_email

PolicyLayer is an MCP gateway — it sits between your AI agents and Fastmail MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_email:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_email": {}
  }
}

get_email is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Fastmail MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Fastmail MCP Server tools

Destructive bulk_delete Delete multiple emails (move to trash) Destructive delete_email Delete an email (move to trash) Write bulk_remove_labels Remove labels from multiple emails simultaneously Write remove_labels Remove specific labels (mailboxes) from an email Write reply_email Reply to an existing email with proper threading headers (In-Reply-To, References). Automa Write test_bulk_operations Test bulk operations by finding recent emails and performing safe operations (mark read/un Write add_labels Add labels (mailboxes) to an email without removing existing ones Write bulk_add_labels Add labels to multiple emails simultaneously

All 38 Fastmail MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_email

What does the get_email tool do? +

Get a specific email by ID. It is categorised as a Read tool in the Fastmail MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_email? +

Register the Fastmail MCP Server MCP server in PolicyLayer and add a rule for get_email: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Fastmail MCP Server. Nothing to install.

What risk level is get_email? +

get_email is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_email? +

Yes. Add a rate_limit block to the get_email rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block get_email completely? +

Set action: deny in the PolicyLayer policy for get_email. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides get_email? +

get_email is provided by the Fastmail MCP Server MCP server (madllama25/fastmail-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Fastmail MCP Server tool call.

Start from Fastmail MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →